I lived with so many booze-a-thon weekends that I finally walked out for good. This being a long weekend, I went up to Phoenix. I dreaded weekends, holidays, special occasions .... and I had to leave. I, too, had lots of details to wrap up - get my degree, get a job, get a place to live. Guess what? I don't have any of them yet but I walked. It got so bad that I didn't care to worry about having my ducks in a row before I left.
The pain of staying outweighed the pain of leaving. Let go and let God was the route I took so I could save my life and sanity. Even if all the stuff you need to do isn't done, you'll leave when your heart tells you to go.
You have my greatest sympathy. I've lived it for a long time, so I realize how hard it is on you. Be good to yourself and take care of YOU.